static GstStateChangeReturn
gst_rtp_ac3_depay_change_state (GstElement * element, GstStateChange transition)
{
GstRtpAC3Depay *rtpac3depay;
GstStateChangeReturn ret;
rtpac3depay = GST_RTP_AC3_DEPAY (element);
/*
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
default:
break;
}
*/
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
/*
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
*/
return ret;
}
static GstBuffer *
gst_rtp_ac3_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
{
GstRtpAC3Depay *rtpac3depay;
GstBuffer *outbuf;
rtpac3depay = GST_RTP_AC3_DEPAY (depayload);
{
guint8 *payload;
guint16 FT, NF;
if (gst_rtp_buffer_get_payload_len (buf) < 2)
goto empty_packet;
payload = gst_rtp_buffer_get_payload (buf);
/* strip off header
*
* 0 1
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | MBZ | FT| NF |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
FT = payload[0] & 0x3;
NF = payload[1];
GST_DEBUG_OBJECT (rtpac3depay, "FT: %d, NF: %d", FT, NF);
/* We don't bother with fragmented packets yet */
outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, 2, -1);
GST_DEBUG_OBJECT (rtpac3depay, "pushing buffer of size %d",
GST_BUFFER_SIZE (outbuf));
return outbuf;
}
return NULL;
/* ERRORS */
empty_packet:
{
GST_ELEMENT_WARNING (rtpac3depay, STREAM, DECODE,
("Empty Payload."), (NULL));
return NULL;
}
}
static gboolean
gst_rtp_ac3_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
{
GstStructure *structure;
GstRtpAC3Depay *rtpac3depay;
gint clock_rate = 90000; /* default */
rtpac3depay = GST_RTP_AC3_DEPAY (depayload);
structure = gst_caps_get_structure (caps, 0);
gst_structure_get_int (structure, "clock-rate", &clock_rate);
depayload->clock_rate = clock_rate;
return TRUE;
}
static GstBuffer *
gst_rtp_ac3_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
{
GstRtpAC3Depay *rtpac3depay;
GstBuffer *outbuf;
rtpac3depay = GST_RTP_AC3_DEPAY (depayload);
if (!gst_rtp_buffer_validate (buf))
goto bad_packet;
{
gint payload_len;
guint8 *payload;
guint16 FT, NF;
payload_len = gst_rtp_buffer_get_payload_len (buf);
payload = gst_rtp_buffer_get_payload (buf);
if (payload_len <= 2)
goto empty_packet;
/* strip off header
*
* 0 1
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | MBZ | FT| NF |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
FT = payload[0] & 0x3;
NF = payload[1];
GST_DEBUG_OBJECT (rtpac3depay, "FT: %d, NF: %d", FT, NF);
payload_len -= 2;
payload += 2;
/* We don't bother with fragmented packets yet */
outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, 2, -1);
GST_DEBUG_OBJECT (rtpac3depay, "pushing buffer of size %d",
GST_BUFFER_SIZE (outbuf));
return outbuf;
}
return NULL;
bad_packet:
{
GST_ELEMENT_WARNING (rtpac3depay, STREAM, DECODE,
("Packet did not validate."), (NULL));
return NULL;
}
#if 0
bad_payload:
{
GST_ELEMENT_WARNING (rtpac3depay, STREAM, DECODE,
("Unexpected payload type."), (NULL));
return NULL;
}
#endif
empty_packet:
{
GST_ELEMENT_WARNING (rtpac3depay, STREAM, DECODE,
("Empty Payload."), (NULL));
return NULL;
}
}
